Method of and apparatus for determining whether an original is p

Details Method of and apparatus for determining whether an original is p Method of and apparatus for determining whether an original is p

1993-06-16

1998-05-05

Lee, Thomas D.

Facsimile and static presentation processing

Facsimile

Picture signal generator

358487, 358464, 358449, 358504, 358505, 358506, H04N 140, H04N 104

Patent

active

057483418

ABSTRACT:
A readout region with a plurality of zones at grid points is scanned by a transparency or reflection reader to obtain any image data therefrom. Then, a variance of each of three primary colors of the image data is calculated, and compared with a predetermined threshold value to determine whether an original is present in the readout region. When at least one of the variances of the three primaries is greater than the threshold value, then it is determined that an original is present in the readout region.

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patent: 5198853 (1993-03-01), Ichihara et al.
patent: 5204913 (1993-04-01), Morooka et al.
patent: 5243663 (1993-09-01), Kudoh

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